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<br />. <br /> <br />Hydrologic Studies <br /> <br />Hydrologic studies were accomplished in the South Platte basin <br /> <br /> <br />in order to define discharge-probability relationships along the South <br /> <br />Platte River from Chatfield Dam to the Colorado-Nebraska State line <br /> <br /> <br />for existing conditions and for projected future urbanized conditions. <br /> <br /> <br />In addition, detailed studies were made for two major tributary <br /> <br /> <br />areas in the South Platte basin, Sand Creek and Boulder Creek, and <br /> <br /> <br />preliminary discharge-probability relationships were developed for <br /> <br /> <br />Kiowa Creek and Bijou Creek. These studies were accomplished using <br /> <br /> <br />historical flow data, watershed modeling techniques and regional <br /> <br /> <br />relationships. A discussion of the methods used and the results <br /> <br /> <br />obtained is presented in the following paragraphs. <br /> <br />The discussion is presented in three parts: (1) the main <br /> <br /> <br />stem of the South Platte River; (2) the tributary studies made for <br /> <br /> <br />Sand Creek, Boulder Creek, Kiowa Creek, and Bijou Creek; and <br /> <br /> <br />(3) a presentation of the modeling techniques and parameters used <br /> <br /> <br />in the studies. <br /> <br />r."w ST8~ - SOOTH PlAnE RIVER <br /> <br />Discharge profiles for the 500-, 100-, 50- and 10-year flood <br /> <br /> <br />events were developed for the main stem of the South Platte from <br /> <br /> <br />Chatfield Dam to the Colorado-Nebraska State line. This analysis <br /> <br /> <br />was accomplished for both existing basin conditions with Chatfield, <br /> <br /> <br />Cherry Creek and Bear Creek dams operating and with existing <br /> <br />30 <br /> <br />. <br />